Changelog for Thunderbird 89

The following WebExtension API changes were introduced in Thunderbird 89.

accounts

api accounts

function get.includeSubFolders — Specifies whether the folders.MailFolder in the rootFolder property of the returned accounts.MailAccount should populate its subFolders property, and include all (nested!) subfolders. This also affects the deprecated folders property of the returned accounts.MailAccount. Defaults to true.
function getDefault.includeSubFolders — Specifies whether the folders.MailFolder in the rootFolder property of the default accounts.MailAccount should populate its subFolders property, and include all (nested!) subfolders. This also affects the deprecated folders property of the default accounts.MailAccount. Defaults to true
function list.includeSubFolders — Specifies whether the folders.MailFolder in the rootFolder property of each found accounts.MailAccount should populate its subFolders property, and include all (nested!) subfolders. This also affects the deprecated folders property of each found accounts.MailAccount. Defaults to true.

api mailTabs

api menus

type OnClickData.fieldId — An identifier of the clicked Thunderbird UI element, if any.
type OnShowData.fieldId — An identifier of the clicked Thunderbird UI element, if any.

api messages

type MessageHeader — Basic information about a message.
type MessageList — See Working with message lists for more information.
type MessagePart — Represents an email message “part”, which could be the whole message.